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Site Report: Thorne Bay DuRette Shop

Site Name: Thorne Bay DuRette Shop
Address: Shoreline Drive, Thorne Bay, AK 99919
File Number: 1528.38.001
Hazard ID: 3298
Status: Cleanup Complete - Institutional Controls
Staff: IC Unit, 9074655229 dec.icunit@alaska.gov
Latitude: 55.685419
Longitude: -132.528016
Horizontal Datum:NAD83

We make every effort to ensure the data presented here is accurate based on the best available information currently on file with DEC. It is therefore subject to change as new information becomes available. We recommend contacting the assigned project staff prior to making decisions based on this information.

Problems/Comments

Site Investigation excavations at shop entrance trying to locate a historical waste oil sump reportedly plumbed from an off-site source resulted in a stockpile of contaminated soil. Diesel range organics (DRO) from 120 parts per million (ppm) to 3,700 ppm and residual range organics (RRO) from 250 ppm to 9,900 ppm were found in site screening soil samples collected from the excavations. Soil analysis also detected elevated levels of arsenic and chromium that are below applicable soil cleanup levels. The underlying soils are influenced by tides, and the fill material included hog fuel and large logs that hindered excavation of the site. No groundwater was encountered during the excavation. Contamination is reported to be less in soils under tidal influence, "close to original content without tidal influence."

Action Information

Action Date Action Description DEC Staff
2/9/2001 Site Added to Database Petroleum contamination confirmed. Bruce Wanstall
2/12/2001 Site Ranked Using the AHRM Preliminary ranking. Bruce Wanstall
2/13/2001 Update or Other Action VCP invitation letter sent to responsible party. Letter also discussed possible contamination at site by KPC Thorne Bay Shop located next door. Bruce Wanstall
6/12/2001 Update or Other Action Second letter sent to RP regarding contamination on site. More definitive evidence needed before we can make a case to ask KPC to become involved. See G:/Spar-Contaminated Sites/SITES/DuRetteConstruction.doc. Bill Janes
3/4/2002 Update or Other Action Project tickler update - No action at this time. Need to think more about next steps. Does not appear RP has taken any action since last June. Bill Janes
4/29/2002 Update or Other Action Project tickler update - Letter sent to Butch DuRette asking to meet at the site on August 7 during the Prince of Wales visit. In site file on G drive. Bill Janes
8/8/2002 Meeting or Teleconference Held Met with Butch DuRette. Told him I would look into applying ACLs from KPCs shop next door. Cleanup needs may be very limited. Bill Janes
1/24/2006 GIS Position Updated Lat long data posted for the maintenance shop; metadata includes use of the DEC facility locator GIS module with personal knowledge of the site projected on aerial photographs of the facility. Scale is 1:12,176 feet, elevation data not available, estimate less than one hundred feet above sea level. Accuracy of Lat Long coordinates is estimated at medium, within 150 meters. Bruce Wanstall
2/26/2008 Exposure Tracking Model Ranking Initial ETM exposure pathway evaluation of the unknown contaminant source area completed. Bill Janes
5/19/2011 Update or Other Action Reassignment opening technical evaluation of the site file to determine the extent and history of residual soil contamination source area. The alleged off-site source of contamination for an oil separation sump is piping run to the former KPC Shop on the adjacent property. In the KPC cleanup investigation the alleged piping run was not identified. Subsurface soil sample from pit #3 in the southwest corner of the property analyzed in 2000 had DRO at 3,700 mg/kg and RRO at 9,900 mg/kg. Bruce Wanstall
11/13/2012 Site Visit In a plain view site inspection DEC observed the shop is still in place and land use is unchanged. Bruce Wanstall
12/18/2013 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for the unknown source area 74273 Bruce Wanstall
3/17/2015 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 74273 Vehicle Maintenance Shop. Bruce Wanstall
3/18/2015 Institutional Control Record Established Institutional Controls established and entered into the database. Robert and Jacqueline Durette shall report intent to sell the property to DEC to ensure the new property owner will agree by signature to uphold the management agreement and Notice of an institutional control (IC) is recorded on the property identifying the nature and extent of contamination at the property and the conditions that the owners and operators are subject to in the future. Institutional controls will be removed in the future if documentation can be provided that shows cleanup levels have been met. Bruce Wanstall
4/15/2015 Cleanup Complete Determination Issued Although a smear zone influenced by tidally fluctuating sea water is present, and the substrate between the remaining contamination and Thorne Bay has a high permeability for contamination to migrate, no discreet point discharge of film, sheen, discoloration or floating oil has been identified on the intertidal shoreline and a consistent discharge has not been observed or reported. As a result, any residual soil contamination migrating to off-site surface water is not exceeding the Water Quality Standard. Petroleum contamination remains on-site in soil above approved cleanup levels; however DEC has determined there is no unacceptable risk to human health or the environment as long as the contamination is properly managed. A Notice of Environmental Contamination (deed notice) shall be recorded in the State Recorder’s Office as an institutional control (IC) that identifies the nature and extent of contamination at the property and the conditions that the owners and operators are subject to in accordance with this decision document. Bruce Wanstall
4/23/2015 Institutional Control Compliance Review IC compliance review conducted and staff changed from Bruce Wanstall to IC Unit. Reminder system initiated to follow-up with the responsible party annually. Kristin Thompson
5/19/2016 Institutional Control Compliance Review IC compliance review conducted. Never received the signed ICs agreement page from the responsible party. Issued an IC reminder letter requesting signature. Kristin Thompson
5/24/2016 Institutional Control Update Contacted via telephone by the property owner who informed me that there has been no sheen or evidence of contamination along the shoreline of their property. Evonne Reese
4/4/2019 Institutional Control Update An Institutional Controls reminder letter was mailed to the landowners on this date. Mossy Mead
12/31/2024 Institutional Control Compliance Review IC compliance review completed on this date. An IC reminder letter was issued to the landowner. The next review will be in five years’ time. Gaige Robinson

Contaminant Information

Name Level Description Media Comments
DRO Between Method 2 Migration to Groundwater and Human Health/Ingestion/Inhalation Soil Highest DRO concentration is 3,700mg/kg. The Method Three DRO cleanup level for KPC TNB sites is 5,700 mg/kg; for this site default DRO cleanup level is 8,250 mg/kg
RRO > Human Health/Ingestion/Inhalation Soil RRO cleanup levels for the site are human health ingestion 8,300 mg/kg

Control Type

Type Details
Signed CS Determination Robert and Jacqueline Durette agree to the terms and conditions of this Cleanup Complete Determination, as stated in decision letter for the Thorne Bay Durette Shop dated April 16, 2015. Failure to comply with the terms and conditions of the determination may result in DEC reopening this site and requiring further remedial action in accordance with 18 AAC 18 AAC 75.380(d)(2).
Notice of Environmental Contamination Notice of an institutional control (IC) recorded on the property identifying the nature and extent of contamination at the property and the conditions that the owners and operators are subject to in the future. Institutional controls will be removed in the future if documentation can be provided that shows cleanup levels have been met.

Requirements

Description Details
Surface water monitoring Periodically monitor the waters of Thorne Bay adjacent to the property for film, sheen, discoloration and floating oils. If such conditions persist implement sorbent boom control measures and contact ADEC. Additional remediation, investigation and control measures may become necessary.
Other Robert and Jacqueline Durette shall report to ADEC of intent to sell or change in land ownership. The management condition agreement must be established with the new owner of the property. The intent to sell and new owner information should be sent to the local ADEC office or submitted electronically to CS.Submittals@alaska.gov.
Advance approval required to transport soil or groundwater off-site. Standard condition.
Movement or use of contaminated material (including on site) in a manner that results in a violation of the water quality standards is prohibited (18 AAC 70) Standard condition.
Excavation / Soil Movement Restrictions If disturbance is planned in any of the areas of the property described as having residual contamination, a work plan must be submitted for ADEC approval, prior to any such site activity begins, to coordinate proper handling of potentially contaminated soil and water on the site.

No associated sites were found.

Missing Location Data

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State of Alaska Department of Environmental Conservation

P.O. Box 111800
Juneau, AK 99811-1800
Phone: 907-465-5066
Fax: 907-465-5245
TDD: 800-770-8973
Physical Location: 410 Willoughby